Consolidated Statements of Cash Flows - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (610,525)	$ 23,969	$ (138,315)	$ (134,201)
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Successor	Predecessor
Accretion expense on obligations	$ 3,176	$ 5,420	$ 8,112	$ 7,653
Depreciation, depletion and amortization	46,196	16,012	11,666	96,901
Share-based compensation cost	3,784	1,227	2,543	4,266
Impairment of oil and natural gas properties	3	3,065	129,082	93,607
(Gain) loss on sales of oil and natural gas properties	5	(697)	(318)	(981)
(Gain) loss on equity securities		11,130	(4,593)
Gain on derivatives, net	(444)	(16,962)	(3,058)	(22,854)
Cash settlements of matured derivative contracts	3,099	(5,824)	19,613	(2,235)
Reorganization items, net	573,304
Other	248	1,020	1,792	1,411
Changes in operating assets and liabilities:
Accounts receivable	(3,518)	7,823	20,385	(2,670)
Other current assets	1,853	(53)	408	(1,585)
Accounts payable and accrued liabilities	4,405	(513)	1,377	(6,783)
Other, net	69	(60)	(1,014)	(829)
Net cash flows provided by operating activities	21,655	45,557	47,680	31,700
Cash flows from investing activities:
Acquisition of oil and natural gas properties				(61,400)
Additions to oil and natural gas properties	(29,727)	(27,368)	(1,304)	(27,268)
Reimbursements related to oil and natural gas properties	652	1,294	1,441	2,517
Proceeds from sale of oil and natural gas properties	3	140,324	119,750	3,654
Proceeds from sale of equity securities			51,675
Other	26	29	50	60
Net cash flows provided by (used in) investing activities	(29,046)	114,279	171,612	(82,437)
Cash flows from financing activities:
Repayment of long–term debt borrowings		(182,000)	(115,000)	(28,000)
Long-term debt borrowings	34,000			26,000
Loan costs incurred	(2,813)
Purchase of treasury stock		(247)	(315)
Dividend payment			(71,256)
Contributions from general partner	40
Other		(8)	(66)
Net cash flows provided by (used in) financing activities	31,227	(182,255)	(186,637)	(2,000)
Increase (decrease) in cash, cash equivalents and restricted cash	23,836	(22,419)	32,655	(52,737)
Cash, cash equivalents and restricted cash - beginning of period	4,896	28,732	6,313	57,633
Cash, cash equivalents and restricted cash - end of period	$ 28,732	$ 6,313	$ 38,968	$ 4,896